Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2016	Dec. 01, 2016	Mar. 31, 2016
Document and Entity Information
Entity Registrant Name	BRT REALTY TRUST
Entity Central Index Key	0000014846
Document Type	10-K
Document Period End Date	Sep. 30, 2016
Amendment Flag	false
Current Fiscal Year End Date	--09-30
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Public Float			$ 54.4
Entity Common Stock, Shares Outstanding		13,898,835
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	FY